Eryngium tripartitum
Eryngium tripartitum
Eryngium tripartitum
Eryngium tripartitum
Tripartite eryngo, Sea Holly
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Description
Eryngium tripartitum or the Tripartite Sea Holly is a beautiful medium-sized perennial with splendid semi-evergreen silver-green foliage, consisting of lobed, dentate basal leaves. From July to September, it continuously blooms with its countless small conical heads that are a remarkable bluish-violet colour. A magnificent blue thistle, to be planted in the sun, in poor, sandy or rocky, very well-drained soil, and to be handled with caution or gloves.
Eryngium tripartitum or Tripartite eryngo, more commonly known as Sea Holly, is native to the Mediterranean region and belongs to the Apiaceae family. This herbaceous perennial with a taproot measures 60 to 90 cm (24 to 35in) tall with a width of 50 cm (20in), forms a compact and bushy, spreading clump with semi-evergreen foliage. It has a rosette of lobed, dentate, oval, and glossy basal leaves, initially green, then silver-grey, and finally becoming silver-green in autumn. Its sturdy, highly-branched, upright and erect stems are a splendid blue-green. From July to September, they bear numerous flower heads that are initially blue, then violet in summer, and finally violet-blue in autumn. Its flowers measure 3.5 cm (1in) long and are cone-shaped, surrounded by narrow bracts, 2 to 4 cm (1 to 2in) long, and blue-grey to dark blue. Its flowers attract many pollinating insects.
This blue thistle appreciates the sun and poor, sandy, and rocky, well-drained soils. Particularly decorative due to its compact bushy habit, its very long, uninterrupted, bluish-violet flowering and its splendid spiny grey-blue foliage, this Sea Holly will be the perfect companion for plants in poor and dry soils, such as Grasses, Wormwoods, Lavenders, Agapanthus, and Garden Irises. However, it is advisable to plant it in the background of flower beds to avoid getting too close to its prickles! This Blue Thistle is one of the best plants for creating splendid dried bouquets. Simply cut the stems before the flowers fully open and hang them upside down to dry.
This Eryngium tripartitum was awarded the Royal Horticultural Society's Award of Garden Merit in 1993.
Eryngium tripartitum in pictures
Flowering
Foliage
Plant habit
Botanical data
Eryngium
tripartitum
Apiaceae
Tripartite eryngo, Sea Holly
Mediterranean
Planting and care
Eryngium tripartitum, a perennial plant that thrives in optimal growing conditions, is hardy up to -15°C (5°F). It is best planted in spring, preferably in a sunny location, in ordinary, light, sandy or gravelly soil, with minimal limestone, that is not too dry but especially well-drained. Its enemy is moisture. It does not tolerate heavy and wet soils, especially during the winter season. Therefore, in the case of heavy soil or in excessively wet regions, it is advisable to mix compost, sand, and gravel with the garden soil and plant it in a raised bed. To ensure good drainage, it will be necessary to place a layer of gravel at the bottom of the planting hole. After flowering, remove faded flowers, unless you want the seeds to disperse in the garden, thus obtaining spontaneous sowing and new young plants. Eryngiums can be attacked by aphids on the stems and flowers, as well as on their roots, weakening the plants and sometimes causing their decline (root rot). On the other hand, they can be susceptible to powdery mildew and attacked by snails and slugs.
Planting period
Intended location
Care
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
The flowering period indicated on our website applies to countries and regions located in USDA zone 8 (France, the United Kingdom, Ireland, the Netherlands, etc.)
It will vary according to where you live:- In zones 9 to 10 (Italy, Spain, Greece, etc.), flowering will occur about 2 to 4 weeks earlier.
- In zones 6 to 7 (Germany, Poland, Slovenia, and lower mountainous regions), flowering will be delayed by 2 to 3 weeks.
- In zone 5 (Central Europe, Scandinavia), blooming will be delayed by 3 to 5 weeks.
In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The planting period indicated on our website applies to countries and regions located in USDA zone 8 (France, United Kingdom, Ireland, Netherlands).
It will vary according to where you live:
- In Mediterranean zones (Marseille, Madrid, Milan, etc.), autumn and winter are the best planting periods.
- In continental zones (Strasbourg, Munich, Vienna, etc.), delay planting by 2 to 3 weeks in spring and bring it forward by 2 to 4 weeks in autumn.
- In mountainous regions (the Alps, Pyrenees, Carpathians, etc.), it is best to plant in late spring (May-June) or late summer (August-September).
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.
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